using System;

using McMaster.Extensions.CommandLineUtils;

public class Program

{

    public static void Main()

    {

        using var commandLineApplication = new CommandLineApplication

        {

            Name = "DateTimeTest",

            Description = "Program to test DateTime options",

        };

        var inputDateTime = commandLineApplication.Option<DateTime>("-i|--input_date_time", "Input date time", CommandOptionType.SingleValue);

        commandLineApplication.OnExecute(() =>

                                         {

                                             Console.WriteLine($"inputDateTime={inputDateTime.ParsedValue}");

                                             return 0;

                                         });

​

        Environment.Exit(commandLineApplication.Execute(new []{"-i", "2020-12-01T00:00:00"}));  

    }

}